Construct capable of release in closed circular form from a larger nucleotide sequence permitting site specific expression and/or developmentally regulated expression of selected genetic sequences
a technology of polynucleotide sequences and constructs, which is applied in the field of constructs, can solve the problems of significant yield loss, significant loss in some crops, and failure to achieve the effect of rna plant viruses, and achieve the effect of facilitating excision and circularization of genetic elements
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example 1
Expression Vectors Based on BBTV
[0159]A series of expression vectors were constructed which contain the cauliflower mosaic virus 35S promoter (355) driving expression of the gene encoding barnase, into which the intron from the potato light-inducible tissue-specific ST-LS1 gene was introduced (NT-INTRON-CT). The terminator was derived from either the gene encoding nopaline synthase (nos) or the major open-reading frame (ORF) of BBTV DNA-6 (BT6).
[0160]The constructs were assembled using PCR with overlapping primers (Table 1) and cloned into pGEM-T vectors using standard techniques known in the art. The expression vector pTBN was constructed and is shown in FIG. 1. pTBN (SEQ ID NO:66) represents the backbone upon which other expression vectors were constructed. Primer names and binding sites are indicated, as is the size of each sequence. pTBN (like the other constructs) was amplified in a step-wise manner. Initially, all three fragments were separately amplified (i.e. 35S, NT-INTRON-...
example 2
Expression Vectors Based on TYDV
(a) Construction of an Intron-Containing Gus Reporter Gene Expression Cassette
[0168]The vector pCAMBIA 2301 was obtained from CAMBIA (Can berra, Australia). This vector contains a 189 by catalase intron within the 5′ portion of the uidA coding region. The CaMV 35S promoter region (800 bp), uidA coding region, and nos terminator were removed from pCAMBIA 2301 as a HindIII / SphI fragment and inserted into similarly digested pGEM-T (Promega) vector. The subsequent construct was designated pGEM-2301. The 800 by CaMV 35S promoter was replaced with the stronger 530 by CaMV 35S promoter by NotI / BglII digestion and ligation. The subsequent vector was designated p35S-2301 (FIG. 7) and served as the template for all subsequent cloning steps.
(b) Isolation of the Tobacco Yellow Dwarf Mastrevirus (TYDV) 9 Large Intergenic Region and Insertion into the Catalase Intron of p35S-2301
[0169]A 272 by fragment incorporating the large intergenic region (LIR) (nt +1 to nt +2...
example 3
GUS Expression Assays Using TYDV Vectors
(a) Transient Rep-Activated Expression of GUS in Dicot and Monocot Cells
[0190]Tobacco (NT-1) cells are maintained essentially as described by An (1985), and prepared for microparticle bombardment as detailed by Dugdale et al. (1998). Banana (Musa spp. Cv. “Ladyfinger” AAA) embryogenic cell suspensions were prepared as previously described. Coating of gold particles and biolistic parameters were essentially as described by Dugdale et al. (1998) or Becker et al. (2000).
[0191]Plasmids used for this study included:—
(i) p355-2301 as positive control (FIG. 7),
(ii) pTEST3 (FIG. 10),
(iii) p355-Rep (FIG. 13), and
(iv) pTEST3 and p35S-Rep.
[0192]Five plates of both cell lines are bombarded for each of the four plasmid combinations. Cells are harvested three days post-bombardment and GUS activity assayed histochemically and / or fluorometrically (Jefferson et al., 1987).
[0193]No endogenous GUS activity is observed in non-bombarded cells. Strong GUS activity,...
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